Finding the Fourth Proportional to 13,871.25, 19,142.33 and 8,911.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,871.25 : 19,142.33 = 8,911.89 : x
2. Step 2: Convert to fraction form
   13,871.25/19,142.33 = 8,911.89/x
3. Step 3: Cross multiply
   13,871.25x = 19,142.33 × 8,911.89
4. Step 4: Simplify right side
   13,871.25x = 170,594,294.74
5. Step 5: Solve for x
   x = 170,594,294.74/13,871.25
6. Step 6: Final answer
   x = 12,298.41